Sewing-machine.



R. L. LYONS.

SEWING MACHINE.

APPLICATION FILED JAN.19. 191s.

Patented Apr. 29, 1919.

Eff/676%?! QM 66 56 1 ma n snare-PATENT WEWQE .nonnnr n. L ons, or WALT, MASSACHUSETTS, assrcnon 'ro rnnnnnctcn osnn'n' eoasae.

' nature referred to in my conranr,

01F YORK, N.'Y., A CORPORATIQN OF NEW YORK.

snwine-macnntn To all whom it may concern.

chines,

panying drawings, forming part thereof.

- Thisinvention has reference to improvements in sewing machines of the general ap lication for Let- ,ters Patent of the United tates Serial No. 660,593, filed November 16, 1911, of which the presentapplication is a continuation in part. a

One object of the invention is to provide a sewing machine with complemental thread breaking devices adapted to break the thread and so constituted that one of said complemental thread breaking devices may be operated by means actuated through the driving mechanism for thestitch forming detit?) vices and the other of said complemental thread breaking devices may be operated in-' dependently of said driving mechanism.

Another bbject of the invention is to so construct a sewing machine of this nature havingoomplemental thread breaking devices of the nature described that at about the completion of the sewing of a group of stitches one of said complemental thread breaking devices is actuated, through means operating in conjunction with the driving mechanism, toresist the movement of the thread soithat at sometime thereafterand usually after the movement of the stitch forming devices has ceased, the other of said, complemental thread breaking devices may be operated to break the thread.

Another object of the invention is to so construct a thread breaking'mechanism having complemental thread breaking devices both located above the. Work, that both of 'said devices may be operated positively but independently and that the actuator of one of said devices may have a retractive movement assisted by a spring. @ther objects of pear from the following description.

The invention consists in such novel features of construction and combination of parts as shall hereinafter be more fully described and pointed out in the claims.

Figure 1, represents a side elevation of Specification of Letters Patent; v .9

Application filed January 19,1916. Serial Ito.

of which the following is a'specifi-' cation, reference being had to the accom-' is effected between the invention will .ap--

Patented Apr. 29,1919.

parts of a single thread'button sewing machine having the improved thread breaking devices, parts of the same being broken away and other parts being shown in section.

Fig. 2, represents a sectional view of the same as taken on line 2-2 Fig. 1.

Similar characters of reference designate corresponding parts throughout.

The invention herein disclosed and forming a part of the invention referred to in my application Serial No. 660,593, above mentioned, is particularly applicable to sin-- gle thread sewing machines having means to sew groups of stitches as in the sewing of buttons to material. In this art it is well known that the stitch forming devices are operated for a predetermined number of movements or during apredetermined time to produce a series or group of attaching stitches, and that during a part at least of such operation relative movement vices and the work, herein understood tobe ton is to-be sewn. It is also well known that, in single thread sewing machines the arrest of the Work from feeding movement while the operation of the stitch forming devices continues will result in the formation of a chain beneath the work and that if said chain be drawn tight against the work a knot, so called, will result. In my present invention I make use of a machine of the nature just above' referred to whereby a se ries or group of stitches is sewn and at the forming devices continue to operate to make one, two or more tying or knotting chain stitches, so called, after which the mechanism is brought to a stop with the thread extending from said chain stitches down to and around the looper and-thence up through the work, through the needle and through various guides to the spool or bobbin.

In the drawings 1 have shown my present invention as applied to a machine of the description referred to above. This showing being for the purpose of illustration is not restrictive. llhe machine shown has the bed 5 in bearings of which is journaled the shaft 6 through which the stitch forming devices, the looper ll: and the needle N with their connections, of any usual construction are the stitch forming de- .a button and the material to which said but- Oil) operated in any known manner. On this shaft 6 is mounted the worm 7 which drives the worm gear 8 and made in part with or secured to the cam 10 which latter is 5 journaled on the stud 11 depending from base 5 and has the usual cam groove 12 of any usual shape to effect the vibration of the follower 13 having the dwell or concentric path 14. This dwell portion 14 of the cam groove 12 preferably is of a length to operate relative to the follower 13 while the stitch] forming devices are making one, two or three stitches.

Follower 13 is mounted on the arm 15 of A l tive movement between the button or work and the stitch forming devices in making a group of button sewing stitches and it is evident that it may be utilized for this purpose.

' The needle N is carried by a needle bar I 19 which with its operating mechanism is mounted in or on the machine head 20 carried by the base -5, said operating mechanism being of I any known kind preferably to be driven from the shaft 6 in some man- 5 ner.

The machine thus described, as statedabove, is of well known construction not in itself invented by me but herein shown and described to illustrate my invention 0 with which said machine is adapted to cooperate. In bearings carried by the head 20 is journaled the 'rock shaft 21' having the lifter arm 22, connected with the button clamp 5 18 by the chain 23 to lift the freeend of said button clamp when said shaft 21 is suitably rocked by the swinging of its lever 24 which lever 24 is adapted to be manually actuated. On said rock shaft 21 are preferably mount 0 ed the stop sleeve 25 and the thread puller arms 26 and 27.: Said arms 26 and 27 do not in their specific location or construction form part of my present invention; therefore said arms are merely indicated.

6 Mounted on the top of the head 20 at a distance back of the needle bar 19 is the thread tension 28'and the thread guide 29 and between these parts, onsaid head 20, is mounted the post 30 and the thread clamp 0 member 31 while on said post 30 is pivotally mounted the thread clamp member 32 adapted to coiiperate with the member 3]. toclamp the thread a2b which passes between these members 31 and 32 in the feed- I movement of said thread toward the needle N and looper L. :A spring 33 is provided which 'acts to swing the thread clamp member 32 in one directionand provision is made to move said clamp member 32 against the action of its spring; such provision is the rod 34 which is shdably mounted in guides of the machine and has the head or member 35 adapted to' act against the "thread clamp member 32 and the end orelement 36. In order to limit the retractive movement of rod 34 I prefer to supply; the

same with the pin 37 the downward movement of which is arrested by the stop sleeve The lifting of said rod 34 as an instrumentality forefl'ecting the clamping ornipping of the needle thread at a predetermined time relative to the operation of the machine as well as to the proposed stopping of the machine is accomplished by the cam or memher 9 of the gear'8 which is located on-said gear 8 in such relation to the dwell 14 of the cam groove 12 of cam 10 that said memher 9 acts to lift said rod 34 at a, time when, in the rotation of said cam'10, the follower 13 isin'th'e cam dwell 14 at a time at which said cam 10 has nearly completed its rot.a--- tion. The purpose of the cam groove or way-12 having the dwell 14 and coiiperating with the follower 13 to effect-the vibration of the button clamp" or work holderhaving ing stitches should be avoided and that the operation of clamping the thread should ocour preferably only after at leastthepartial formation of a tying stitch.

In preparing. this machine for operation the thread w-b is threaded through the various guide eyes and the eye of the needle N in the usual manner but, in addition, extends between the members 31 and 32 of. the

thread clamping or thread restraining de- The machine is supplied with any usual driving means adapted to effect a predetermined. number of rotations of shaft 6 and, through said shaft, a predetermined number of operations of the stitch forming devices which number of rotations may be varied in different kinds of work or may eoaeea 1 ton clamp 18 a number. of times dependent one-or more chain stitches.

ng operatlon and the formation of such clamp or press the tween the clamp tion of ing said slide rod the thread is broken. Practically simultane- .somewhat on the number of attaching stitches to be made but the length of the concentric portion or dwell 14 of said groove may be the. same in all such cases.

' The machinehaving been started the stitch forming devices are operated and the button clamp 18 is vibrated while the waved porcam groove 12 is traveling by said follower 13 but. when the dwell 14 o said groove 12 receives'said follower 13 the vibration of said follower and of the button clamp and the work carrid by said clamp ceases so that the continued operation of the stitch forming devicesresults in the formation of During such sewchain stitches the thread a?; is free to feed toward and supply thread to the needle, said thread being controlled in such eeding movement mainly by the usualtension' devices. Thus, as the predetennined number of attaching stitches and chain. stitches approaches completion thethreadw-bwill not be under any strain unnecessary for the sewing operation.

At or about the last chain stitch the cam 9 of the rotating member 8 will ride beneath the element 36 of rod '34 and will raise said rod and thereby move the thread clamp member 32 to thread ab against the thread clamp member 31, said cam 9 hold- 34 against retraction until ously with such clamping or engaging of the thread a'b between the members 32 and 31 the operation of the machine will cease. The unbroken thread will now extend bemembers 32, 31 which will be a point of restraint on the thread, through the usual guides, through 'the needle N, through the work held by button clamp 18, down and around the looper L and up to the work to which said thread will be attached by the chain-stitches above referred to, thus completing the operation whereby the thread maysubsequently be broken.

At a time after the stopping of the machine, determined by the will of the operator, lever 24 may be swung to partially rotate shaft 21 and to actuate'arm 22 to lift chain 23 and the movable end of button clamp 18 which button clamp will lift the work with the result that a strain will be put upon the thread a-b which strain being resisted at the point of restraint defined by the clamp members 32,31 will first cause the chain stitches at the work to be tightened somewhat and, if such upward movement of the work is continued, willultimately cause the breaking of the thread at the tightened chain or tying stitches, leaving the length of thread which had, before such breaking, ex-

time of making of the tended around thelooper and back to the needle as a long starting end whereby the next sewing operation can be started without ret-hreading the needle.

When the machine is again started cam 10 is operated through its gear 8 and during the first downward movement of the needle release rod 34 so that said-rod may move ret-ractively by gravity, through the action of spring 33 or in any other manner and pressure on the clamp member 32 is relieved whereby the thread ab is again free from said clamp device sufficiently to 'feed forward to the needle. ment ofrod 34 is limited by the interception of its pin 37 by the stop 25.

I am aware that button clamps or work holders have been heretofore so constructed that they could-be raised or moved relative to the placing of work or button clamp. however it is apparent that the button clam-p or work holder is given an additional function'not heretofore present in such devices its removal from said The retractive movethe cam or actuator member is moved to.

bed of the machine to facilitate the In my present invention.

and that such function is complementary to g the means for operating the movable member of the thread clamp in one direction through mechanism operating in conjunction with the driving mechanism for the stitch forming devices. lln this respect I may further define and, to some extent, restrlbt my invention to devices of this nature which operate with or are operated from devices actuated through the driving mechanism toaccomplish the clamping or restraining of the needle thread, that when the ma chine is stopped said thread extends unbroken through the needle and the work around that a complementary strain applied to said the looper and back to the work so purpose of so preparing the thread v thread through an independently operated device may thread.

' Having thus described my invention I claim as new and Patent,

1. A sewing machine comprising stitch forming means, mechanism for actuating said stitch forming means, a pair of complemental thread breaking devices both located efiect the' breakage of said desire to secure by Letters rec above the work, connections between one of said devices and said actuating means to efi'ectrelative movement between saiddevice and the stitch forming means during a series of stitch forming operations and to prevent said relative movement during a chain stitch operation, means operated in conjunction with said actuating means to operate the other of said devices after said chain stitch operation, to restrain the thread, and manufilly operated means to more said first device tobreak the thread.

2. A sewing machine comprising stitch forming means. mechanism for actuating said stitch forming means. a pair of comple mental thread breaking devices both located above the work, one of which is a button clamp, connections between said button clamp and said actuating means to eflect relative movement between said button clampand the stitch forming means during aseries of stitch forming operations and to arrest said movement during another stitch forming operation, means progressively moved by said actuating means to actuate a controlling element of one of said devices whereby said device may be brought into action after said last mentioned stitch forming operation to restrain the thread, and means for operating said button clamp to break the thread.

3. A sewing machine comprising stitch forming means, a work holder, means for manually lifting said work holder, a thread breaking mechanism comprisin a thread clamp mounted above the Work iolder and having a pair of members between which the thread may be engaged, a slide rod,

means for actuating said stitch forming means, means operated through said actuating means to project said rod its full movement in one direction and to permit the full retraction of said rod during substantially the entire sewing operation, and a: spring acting on said thread clamp in opposition to said rod.

4. A sewing machine comprising stitch forming means, a work holder, means for manually lifting said workholder, a thread breaking mechanism comprising a thread clamp mounted above the work holderand having a pair of members between which the thread may be engaged, a spring acting to move one of said members, a slide rod for operating said clamp against the action of said spring, means for actuating the stitch forming devices, and means operated through said actuating means to move said slide rod positively in one direction and to hold said slide rod against retraction.

5. A sewing machine comprising stitch forming means, a work holder, means for manually lifting said work holder, a thread breaking mechanism comprising a thread clamp mounted above the work holder and having a pair of members between which the thread may be engaged, a spring acting to move one of said members, a slide rod for operating said clamp against the action of said spring, means for actuating the stitch forming devices, and mechanism for holding said rod froiif'movement and having means operating in conjunction with the stitch forming means to effect the release of said rod to permit its movement.

ROBERT L. LYONS. 

